Enclosure with an E-fuse connected to multiple blade computers

Abstract

One embodiment is an enclosure that has a plurality of server computers connected to an e-fuse. A circuit in the enclosure provides a 400V output to the e-fuse.

1. An enclosure, comprising:
 a plurality of servers; 
 an e-fuse connected to the servers; and 
 a circuit that provides a 400V output to the e-fuse, the circuit includes an output capacitor that initiates timing upon detecting an output voltage to the e-fuse that exceeds a predetermined limit. 
 
     
     
       2. The enclosure of  claim 1 , wherein the circuit includes a MOSFET transistor that switches current on and off to the e-fuse. 
     
     
       3. The enclosure of  claim 1 , wherein the circuit includes a MOSFET transistor and a resistor that monitors current flowing to the MOSFET transistor and shuts off the MOSFET transistor upon detecting a current at a predetermined level. 
     
     
       4. The enclosure of  claim 1 , wherein the e-fuse is triggered when the timing exceeds the predetermined limit and the e-fuse continues to operate when the timing does not exceed the predetermined limit. 
     
     
       5. The enclosure of  claim 1 , wherein the circuit includes a transistor and a controller connected to the transistor through an Enable pin that turns the transistor on and off. 
     
     
       6. The enclosure of  claim 1 , wherein the circuit includes a transistor and a timing capacitor that holds the transistor in a linear region for a pre-programmed period of time between 100 μS to 200 μS before activating the e-fuse. 
     
     
       7. An enclosure, comprising:
 plural blade computers; 
 two backplanes connected to the blade computers; 
 two AC power sources that provide redundant power to the backplanes; and 
 an e-fuse circuit that includes an e-fuse and circuitry to provide a 400V power supply through the enclosure, the e-fuse circuit includes a timing capacitor that prevents false triggering of disruption to power to the plural blade computers when the e-fuse circuit detects a voltage spike. 
 
     
     
       8. The enclosure of  claim 7 , wherein each of the two backplanes includes a separate 400V e-fuse. 
     
     
       9. The enclosure of  claim 7 , wherein each of the plural blade computers includes a separate 400V e-fuse. 
     
     
       10. The enclosure of  claim 7 , wherein the e-fuse circuit includes a transistor and a resistor that continuously monitors current flowing through the circuitry and shuts off the transistor upon detecting a current that exceeds a predetermined limit. 
     
     
       11. The enclosure of  claim 7 , wherein the enclosure includes eight blade computers receiving power from a first one of the two backplanes and eight other blade computers receiving power from a second one of the two backplanes. 
     
     
       12. The enclosure of  claim 7 , wherein the e-fuse circuit includes a transistor and an output capacitor that functions to reduce output voltage to the e-fuse to 50V or less after a period of ten seconds. 
     
     
       13. The enclosure of  claim 7 , wherein the e-fuse circuit isolates a fault within 100 microseconds. 
     
     
       14. A method executed by an e-fuse circuit in an enclosure housing plural servers, the method comprising:
 providing 400V to the e-fuse circuit; 
 monitoring output voltage of the e-fuse circuit; and 
 waiting a time period designated by a timing capacitor before activating a fuse to discontinue power to the plural servers after a detection that the output voltage is rising. 
 
     
     
       15. The method of  claim 14  further comprising:
 detecting a fault with the e-fuse circuit; 
 disconnecting load the plural servers within 100 microseconds of detecting the fault. 
 
     
     
       16. The method of  claim 14  further comprising, determining that the fuse properly operated when the output voltage is not rising and input current to the fuse is below a current limit. 
     
     
       17. The method of  claim 14  further comprising, inserting and extracting one of the servers without disturbing the 400V distribution through the enclosure. 
     
     
       18. The method of  claim 14  further comprising, providing a 400V e-fuse inside each of the plural servers.